13509745 has 8 divisors (see below), whose sum is σ = 16434216. Its totient is φ = 10659456.

The previous prime is 13509689. The next prime is 13509757. The reversal of 13509745 is 54790531.

It can be written as a sum of positive squares in 4 ways, for example, as 1669264 + 11840481 = 1292^2 + 3441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13509745 - 2⁹ = 13509233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13509745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18142 + ... + 18871.

It is an arithmetic number, because the mean of its divisors is an integer number (2054277).

Almost surely, 2^13509745 is an apocalyptic number.

It is an amenable number.

13509745 is a deficient number, since it is larger than the sum of its proper divisors (2924471).

13509745 is an equidigital number, since it uses as much as digits as its factorization.

13509745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37091.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 13509745 is about 3675.5605014746. The cubic root of 13509745 is about 238.1674374344.

The spelling of 13509745 in words is "thirteen million, five hundred nine thousand, seven hundred forty-five".